动态获取数据源加载控件时失败

[Lipeiheng]

var imglist;
        $( function (){
              $.ajax({
              url:'/WechatWeb/Custom/GetPicToProblem.ashx',
              type:'post',
              dataType:'json',
              data:{"No":1},
              async: false,
              success :function(data)
              {                   
                 if (data!=null)
                  {
                     imglist=data;
                 }
                 var iSlider = new iSlider({
                     dom : document.getElementById('iSlider-wrapper'),
                     data: imglist,
                     isLooping: 1,
                     isOverspread: false,
                     plugins: ['dot', 'button', ['zoompic', { zoomFactor: 3 }]]

                 })     
              }
          
          })
         }        
           )   
     </script>

提示，iSlider is not a constructor 如果放在Success外面，data缺为空